This Winchester manufactured third variation bolt assembly with a third variation larger checkered radius on the firing pin head, first variation bolt body and late variation firing pin is for the model 04 bolt action rimfire rifle in 22 S. L & XL caliber. This bolt assembly is in very good condition exhibiting a grayish brown patina with light wear. This bolt assembly will NOT work in the later model 04A chambered in 22 S, L & LR caliber.  (file photo)